Robert Nystrom
fc1b1ecc71
Change-Id: Idbcc965a27e9ffeedf5e0a1068b019de4193070f Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/127745 Commit-Queue: Bob Nystrom <rnystrom@google.com> Reviewed-by: Alexander Thomas <athom@google.com>
51 lines
1.2 KiB
Dart
51 lines
1.2 KiB
Dart
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// Test overriding of fields.
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import "package:expect/expect.dart";
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class A {}
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class B1 extends A {}
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class B2 extends A {}
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class Super {
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Super() : super();
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B1 field;
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}
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class Sub extends Super {
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Sub() : super();
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// Invalid override. The type of 'Sub.field' ('() → A') isn't a subtype of
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// 'Super.field' ('() → B1').
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A field; // //# 00: compile-time error
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}
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class SubSub extends Super {
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SubSub() : super();
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// B2 not assignable to B1
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B2 field; // //# 01: compile-time error
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}
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main() {
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SubSub val1 = new SubSub();
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val1.field = new B2(); //# 02: compile-time error
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Expect.equals(true, val1.field is B2); //# 02: continued
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Sub val2 = new Sub();
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val2.field = new A(); //# none: compile-time error
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Expect.equals(true, val2.field is A);
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Expect.equals(false, val2.field is B1);
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Expect.equals(false, val2.field is B2);
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Super val3 = new Super();
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val3.field = new B1();
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Expect.equals(true, val3.field is B1);
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Expect.equals(false, val3.field is B2);
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}
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